JB4 BMW B58 GEN1 & GEN2

OVERVIEW

The JB4 B58 tuner from Burger Motorsports is a plug-and-play tuning system for GEN1 and GEN2 BMW B58 turbocharged engines, delivering up to 120hp and 120 lb-ft at the wheels on a completely stock engine running pump gas — no ECU flash required, and fully compatible with locked ECUs. Both versions include the JB4PRO Bluetooth adapter and free app.

SPECS

• Up to 120hp / 120tq gains at the wheels on pump gas; higher with bolt-ons, higher octane, E85, or larger turbos
• JB4PRO board: built-in Bluetooth, fuel pressure control for ethanol tuning, flex fuel/port injection/WMI control via PNP add-on harness, and onboard data-logging memory
• On-the-fly map switching, boost-by-gear control, progressive water/methanol integration, fault code reading/clearing, direct electronic wastegate control, and exhaust flapper control on supported models
• Map guide: Map0 (stock/JB4 disabled), Map1 (+3psi, 91 oct), Map2 (+4psi, 91-93 oct), Map3 (+6psi, 93+ oct), Map4 (20psi target, 93+/E30), Map5 (22psi target, E30+ recommended), Map6 (custom user map), Map7 (progressive water/meth), Map8 (valet/low boost)
• CARB approved under Executive Order D-744-4 for many 2016-2018 applications (230i, 330i, 430i, 530i, 340i, 440i, 740i, M240i, X1)
• Not VIN-locked and fully removable; includes billet aluminum enclosure
• Designed and assembled in the USA; 5-year warranty
• For the newer B58TU2 Gen3 engine, see the separate B58 Gen3 JB4 listing

PARTS INCLUDED

• 1x JB4 (or JB4PRO) tuner unit in billet aluminum enclosure
• Plug-and-play installation harness

TECH RESOURCES

• Simple plug-and-play wiring harness — install as your first upgrade with no staged tuning or additional modifications needed
• The JB4PRO smartphone connection (Bluetooth 4.0, iOS/Android) fits inside the enclosure and lets you record/analyze data, change maps, and update firmware
• See the JB4 B48/B58 install guide (PDF) for step-by-step instructions; a CARB-compliant install guide is also available for California customers
• 91 octane or better is required for performance gains

VEHICLE APPLICATIONS